Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 58515f3eb6c2c6030a07c2cf56ff666bf2a89a53c5176d7abf69e5ad892068ad:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^